JEE Main 9 April 2017 Paper Solved Paper
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A Laser light of wavelength 660 nm is used to weld Retina detachment. If a Laser pulse of width 60 ms and power 0.5 kW is used the approximate number of photons in the pulse are :
[Take Planck’s constanth = 6.62 × 10 − 34
[Take Planck’s constant
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